According to reports Friday, two cross-dressing men in a vehicle rammed the gate surrounding the National Security Agency headquarters in Maryland’s Fort Meade. Fox News indicates a guard at the base began arguing with the two men at approximately 9:30 a.m. before witnesses reported hearing gunshots.

At this time, authorities believe the guard fired the shot, striking at least one of the men. The NSA released a statement indicating one of the suspects died and the other was injured in the incident.

The statement confirms the pair “attempted to drive a vehicle into the National Security Agency portion of the installation without authorization” and that the agency’s security team “prevented them from gaining access to the installation.”

A source cited by Fox News indicated the injured suspect was transported to a local hospital, noting there were reports of other injuries. An officer is believed to have sustained an injury to the arm, a claim supported by reports that a uniformed individual was wheeled away from the scene on a stretcher.

As for the possible motive behind the attack, authorities are not yet prepared to comment beyond suggesting that it was not terrorism related.

The White House confirmed Barack Obama has been briefed on the incident and, as spokesperson Eric Schultz explained, “will be updated as appropriate.”

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Friday’s attack marked the second within the month on an NSA building. Hong Young, who admitted to firing shots at the building, told authorities he was following the commands of voices telling him to shoot at a vehicle at the scene.